Combination abrading and exhaust unit



Nov. 17, 1964 c. R. BARKLEY 3,157,009

COMBINATION ABRADING AND EXHAUST UNIT Filed May 15, 1963 3 Sheets-Sheet 1 INVENTOR. CHARLES REX BARKLEY BY MAHONEY', MILLER 8- RAMBO ATTORNEYS.

Nov. 17, 1964 c. R, BARKLEY 3,157,009

' comnxmnou ABRADING AND EXHAUST UNIT Filed May 15. 1963 3 Sheets-Sheet 2 INVENTOR. CHARLES REX BARKLEY BY Mqyt-lONEY, MILLER & RAMBO ATTORNEYS.

Nov. 17, 1964 c. R. BARKLEY COMBINATION ABRADING AND EXHAUST UNIT 3 Sheets-Sheet 5 Filed May 15, 1963 INVENTOR. CHARLES REX BARKLEY a) BY MAHONEY, MILLER & RAMBO BY M AT ORNEYS.

United States Patent 3,157,009 COMBINATEUN ABRADING AND EXHAUST UNlT Charles Rex Barkley, New Lexington, Ohio, assignor to Evans Reamer and Machine Company, New Lexington, Ohio, a corporation of Ohio Filed May 15, 1963, Ser. No. 280,655 2 Claims. (ill. 51-273) This invention relates to a combination abrading and exhaust unit. It has to do, more particularly, with a unit which includes a carrier for an abrasive disc having directly associated therewith an exhaust system for removing the dust during the abrading operation.

This invention deals specifically with that type of abrading unit which includes a rotatable carrier in the form of a metal disc upon the face of which an abrasive disc is suitably secured. The object to be abraded is positioned in contact with the outer face of the mounted abrasive disc. This type of unit is commonly used as a brake shoe grinder.

Heretofore, it has been the practice in connection with brake shoe grinders of the type indicated to have a separate exhaust system for sucking out the grinding dust while grinding the brake lining of brake shoes. This separate exhaust system involves a motor, fan, and associated parts which is relatively expensive. There is, therefore, a need for a grinder with a built-in economical exhaust system that would operate from the same motor that drives the grinding disc carrier without increasing the required horsepower of the motor and which completely eliminates the separately motorized exhaust system. The present invention effectively and economically meets these requirements.

The accompanying drawings illustrate a combination abrading and exhaust unit embodying this invention, specifically, in the form of a brake shoe grinder but it is to be understood that the unit is capable of performing other abrading operations.

In these drawings:

FIGURE 1 is a face view of the unit, partly broken away.

FIGURE 2 is an enlarged vertical sectional view taken along line 2-2 through the unit of FIGURE 1.

FIGURE 3 is a reduced vertical sectional view taken along line 3-3 of FIGURE 2 through the unit.

FIGURE 4 is a detail in horizontal section taken along line d-4 of FIGURE 1.

FIGURE 5 is a detail in vertical section taken along line 5-5 of FIGURE 3.

With reference to the drawings, a unit embodying this invention is shown as comprising a drum-like housing It) which is suitably supported in upright position as by a supporting frame or standard 11 to which it may be bolted or otherwise rigidly secured. The housing is formed of two opposed sections (FIGURE 2), preferably in the form of castings, and comprising the outer or forward dust guard section 12 and the inner or rear blower housing section 13 which are provided with telescoping peripheral adjacent edges as indicated at 14, an outwardly extending stop flange 15 limiting the extent of telescoping. A series of angularly spaced clamping bolts 16 clamp the two drum sections in interfitting cooperative relationship.

The drum housing 10 so formed is adapted to enclose an integral rotatable member 2% which includes the forward abrasive carrier 21 and the rearward exhaust fan 22 spaced axially behind the carrier 21. The member is fixed on the forwardly projecting drive shaft 23 of an electric motor as by a screw 25 and associated slot. The motor 24 is bolted to the standard 11 directly behind the housing 19 and its shaft projects forwardly through an opening 26 in the back vertical wall 27 of the housing pro vided by the section 13. As will appear later, this opening 26 is eccentrically disposed in the wall 27.

The forward vertical wall 28 of the housing 10 provided by the dust guard section 12 is provided with a relatively restricted Work-receiving slot or opening 29 which is offset to one side.

The carrier 21 is in the form of a relatively heavy disc having a fiat outer face to which an abrasive disc 30 may be cemented or otherwise secured. It will be noted (FIG- URES 1 and 2) that the carrier disc 21 is eccentrically disposed in the dust guard section 12 so that a peripheral chamber 31 of crescent form is provided around it. In order to form eddy currents to prevent accumulation of dust along the outer wall of the chamber 31, inwardly extending spoiler lugs 32 are provided at angularly spaced intervals in the chamber, the spoilers projecting generally in the direction of rotation of the disc carrier 21. Centrifugal force will normally tend to cause the dust particles to accumulate and circulate in a torus-like pattern around the disc 21 and to collect along the outer wall but the spoiler lugs 32 will prevent this.

The fan 22 comprises a dish-shaped body with its concave side rearmost (FIGURE 2), and which is formed integral with the carrier 21. The forward convex side of the fan body carries a series of angularly spaced blades 35 which are formed integral therewith. Each of these blades is curved to sweep rearwardly relative to the direction of rotation of the fan which is counterclockwise as viewed in FIGURE 3. Each of the blades extends from the periphery of the fan body inwardly to a point spaced from the hub 2th: of the member 21 at which point the end of the blade is angled as indicated at. 35a. It will be noted (FIGURES 2 and 3) that the fan 22 is disposed eccentrically in the fan or blower housing section 13 to provide a volute chamber 36 around the fan within the section. At its lower side this chamber communicates with a tangential discharge outlet portion 13a formed integral with the casting 13.

To separate the respective chambers of the housing in which the carrier 21 and the fan 22 are located, except around the axis of the hub 20a, a baflie 4% is provided which is in the form of an annular plate made of the two half-sections 49a and 4611. These sections cooperate to provide an axial suction inlet 41 around the hub 20a from the carrier chamber into the fan chamber. It will be noted that each bafile section extends inwardly and has its outer edge secured by screws 42 to a flange of the casting section 13. The adjacent edges of the two half-sections 4th: and 4% meet and are connected together by the inner clips 43 (FTGURES 3 and 5) and the outer screws 42. These clips 43 are of grooved cylindrical form and are positioned in opposed notches in the adjacent edges of the respective sections.

In the operation of this unit, the work to be abraded is introduced through the opening 29 into contact with the abrasive disc 39. For example, as indicated schematically in FIGURE 4, this may be a brake shoe B having a lining to be ground and being suitably supported for the operation to move arcuately into contact with the face of the abrasive disc 30. This disc will be rotating with the carrier 21 which, along with the integral fan or blower 22, will be driven by the motor 24. Thus, the integral unit 20 is driven by the motor and due to the combining of the weight and inertia of both the fan and the disc carrier, adequate kinetic energy is stored, as in a flywheel, so as to assist in overcoming increased power requirements in driving both members rather than the carrier only.

A good part of the dust and abraded particles will settle down to the exhaust outlet 13a which is directly below the opening 29 but some of the particles will be thrown outwardly by centrifugal force. The vacuum created in the fan chamber will draw these particles inwardly along the inwardly directed battle 4% toward the axial suction inlet 41 and this action will be enhanced by the spoiler lugs 32. The particles drawn through the suction inlet 41 will be directed by the fan blades 35 in the chamber 36 until they are swept through the discharge outlet 13a which may be connected to a suitable waste container.

It will be apparent that this invention provides an abrading unit having an integral abrasive disc carrier and exhaust fan. The exhaust fan is so combined with the. carrier, that the abraded particles are exhausted directly from the carrier and discharged immediately. Since a separate exhaust system is not required, there is not only a great savings in cost but the exhaust arrangement is more effective. Also, substantially no increase in horsepower for the driving motor is required, as compared to a motor for driving the carrier alone.

According to the provisions of the patent statutes, the principles of this invention have been explained and have been illustrated and described in what is now considered to represent the best embodiment. However, it is to be understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically illustrated and described.

Having thus described this invention, what is claimed is:

1. In an abrading machine; a supporting frame; a generally cylindrical, hollow, housing stationarily carried by said frame and including back, front and peripheral walls defining an internal, generally cylindrical chamber, the

front wall of said housing being formed with a relatively reduced area access opening through which a work piece may be introduced to the interior of said housing; a motor carried by said frame rearwardly of said housing and including a drive shaft extending rotatably through the back wall of said housing and into said chamber; a combined, rotary abrasive disc, and exhaust fan unit drivingly carried by said shaft within the chamber of said housing, said unit comprising a forward, abrasive-supporting disc portion positioned inwardly from the access opening formed in the front wall of said housing, a rearward, centrifugal discharge fan portion disposed in axially spaced relation behind said disc portion and a reduced diameter hub portion extending between and connecting said disc and fan portions, said unit being disposed in eccentric relation to the chamber of said housing; an annular batlie wall carried by and extending radially inwardly of said housing between the disc and fan portions of said unit and defining a relatively restricted opening disposed in concentric, spaced relation to the hub portion of said unit, said baflie wall dividing the internal chamber of said housing into separate, abrading and exhaust compartments communicating with one another only by way of the opening in said bafiie wall; means on said housing defining an exhaust port in tangential communication with said exhaust compartment; and a plurality of relatively spaced spoiler lugs stationarily carried by the peripheral wall of said housing and projecting inwardly of the abrading compartment toward the periphery of the disc portion of said unit, said spoiler lugs being inclined in the direction of rotation of said unit and being operable upon rotation of said unit to prevent a circumferential pocketing of air and entrained particles within the abrading compartment of said housing.

2. An abrading machine as defined in claim 1, wherein the fan portion of said unit comprises a generally concavoconvex, circular body having its convex surface facing toward the disc portion of said unit and formed with a plurality of relatively spaced blades projecting axially outwardly from its convex surface and inclined in the direction of rotation of said unit.

References Cited in the file of this patent UNITED STATES PATENTS 1,180,413 Munson Apr. 25, 1916 2,252,160 Blood Aug. 12, 1941 2,379,503 Teager July 3, 1945 2,414,056 Nieman Jan. 7, 1947 2,419,744 Thwaites Apr. 29, 1947 2,645,886 Peterson July 21, 1953 3,064,400 Johnson Nov. 20, 1962 FOREIGN PATENTS 648,551 France Aug. 14, 1928 

1. IN AN ABRADING MACHINE; A SUPPORTING FRAME; A GENERALLY CYLINDRICAL, HOLLOW, HOUSING STATIONARILY CARRIED BY SAID FRAME AND INCLUDING BACK, FRONT AND PERIPHERAL WALLS DEFINING AN INTERNAL, GENERALLY CYLINDRICAL CHAMBER, THE FRONT WALL OF SAID HOUSING BEING FIRMED WITH A RELATIVELY REDUCED AREA ACCESS OPENING THROUGH WHICH A WORK PIECE MAY BE INTRODUCED TO THE INTERIOR OF SAID HOUSING; A MOTOR CARRIED BY SAID FRAME REARWARDLY OF SAID HOUSING AND INCLUDING A DRIVE SHAFT EXTENDING ROTATABLY THROUGH THE BACK WALL OF SAID HOUSING AND INTO SAID CHAMBER; A COMBINED, ROTARY ABRASIVE DISC AND EXHAUST FAN UNIT DRIVINGLY CARRIED BY SAID SHAFT WITHIN THE CHAMBER OF SAID HOUSING, SAID UNIT COMPRISING A FORWARD, ABRASIVE-SUPPORTING DISC PORTION POSITIONED INWARDLY FROM THE ACCESS OPENING FORMED IN THE FRONT WALL OF SAID HOUSING, A REARWARD, CENTRIFUGAL DISCHARGE FAN PORTION DISPOSED IN AXIALLY SPACED RELATION BEHIND SAID DISC PORTION AND A REDUCED DIAMETER HUB PORTION EXTENDING BETWEEN AND CONNECTING SAID DISC AND FAN PORTIONS, SAID UNIT BEING DISPOSED IN ECCENTRIC RELATION TO 